adjacent_boundary_v2 retrained with bibr's multilingual header/onset patterns ported into the geometry features. Real-OCR non-Anglo 7-paper set: overall boundary F1 0.6940 vs 0.4849 for the previous pinned bundle (id 0.87 vs 0.00, pt 0.38 vs 0.10, en 0.73 vs 0.57, no regressions). Frozen English gold 0.9960 vs 0.9958 (gate EPS 0.005, PASS). Requires the adjacent-features pattern code (bibr feat/refseg-adjacent-features) at inference. Verdict: bibr-training docs/superpowers/findings/2026-08-01-refseg-multilingual-verdict.md
Rebuild adjacent-boundary geom segmenter for bibr runtime
